Mineral In A Matrix (Likely Quartz Or Feldspar)

Likely polished black-and-white stone fragment

Indeterminate from image; possibly tourmalinated quartz, black-and-white jasper, or coated stone

Dumortierite Quartz

Al7(BO3)(SiO4)3O3

Polished orbicular gabbro (likely “leopard-skin” or larvikite-type material)

Gabbro, a coarse-grained mafic plutonic rock; chiefly plagioclase feldspar and pyroxene, with possible olivine/amphibole and iron oxides

Basalt Porphyry

Porphyritic Basalt

Schist with Biotite and Quartz

Biotite-Quartz Schist (Fe,Mg,Al silicate mix)

Milky quartz-rich rock

Quartz, SiO₂; possibly quartzite or massive vein quartz

Likely lepidolite-bearing pegmatite

Lithium-mica pegmatite, chiefly lepidolite (K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂) with quartz and feldspar

Pegmatitic granite (quartz–feldspar–mica rock)

Granitic pegmatite; mainly quartz (SiO₂), feldspars, and biotite/muscovite mica

Quartz-rich pegmatite or weathered feldspathic rock

Granite-family pegmatite; likely quartz (SiO₂) with feldspar and mica

Quartz-rich feldspathic rock, possibly granite or pegmatite

Granite/pegmatite; primarily quartz (SiO₂) and feldspar, with possible mica

Schorl (Black Tourmaline) in Quartz or Feldspar Matrix

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl) in Granitic Pegmatite

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly weakly foliated gneiss

Granite (likely biotite granite)

Coarse-grained felsic plutonic rock composed mainly of quartz, alkali feldspar, plagioclase, and biotite/hornblende

Gneiss (likely banded granitic gneiss)

Quartz–feldspar–mica gneiss; commonly containing biotite and hornblende

Quartz-rich rock, possibly pegmatite

Likely quartz–feldspar pegmatite; exact identification is uncertain from the photograph

Garden Quartz

Silicon Dioxide (SiO2) with various inclusions (Lodolite)

Dragonstone (Brecciated Basalt/Diabase with Epidote and Quartz)

Brecciated mafic igneous rock

Weathered feldspar-rich granite or granitic pegmatite

Altered granite/pegmatite, composed mainly of quartz (SiO₂), alkali feldspar, plagioclase, and dark mica or amphibole

Iron-stained quartz-rich rock, possibly weathered granite or pegmatite

Quartz–feldspar rock with iron-oxide alteration; exact identification is uncertain from the photograph

Gneiss with Quartz/Feldspar Vein

Quartz-Feldspathic Gneiss

Rounded porphyritic volcanic rock, likely andesite

Porphyritic andesite; chiefly plagioclase feldspar, pyroxene and/or hornblende in a fine volcanic groundmass

Greenstone pebble

Likely chlorite- and/or actinolite-bearing metamorphic rock; exact composition cannot be determined from the image.

Granite (with Beryl/Aquamarine)

Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)

Quartz-rich pegmatite fragment

Granitic pegmatite, chiefly quartz (SiO₂) with feldspar and mica

Pink granite (likely)

Granite, a quartz–feldspar plutonic rock

Coarse-grained granite or granitic pegmatite

Granite; primarily quartz (SiO₂), feldspar, and mica/amphibole

Weathered granite

Granite; interlocking quartz–feldspar–mica aggregate

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)

Quartz-rich pegmatitic rock, possibly rose quartz with mica

Granitic pegmatite; predominantly quartz (SiO₂), with feldspar and mica

Weathered sandstone or arkosic conglomeratic sandstone

Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by silica, calcite, or iron oxides

Pegmatite containing Muscovite and Quartz

Granitic Pegmatite (SiO2 with KAl2(AlSi3O10)(OH)2)

Mica schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.

Likely quartz-rich stone or pale feldspar fragment

Indeterminate; possibly quartz (SiO₂) or feldspar (KAlSi₃O₈–NaAlSi₃O₈)

Pegmatitic granite with quartz and feldspar

Granitic pegmatite; chiefly quartz (SiO₂), alkali/plagioclase feldspar, and mica, with possible garnet/tourmaline

Jasper

Silicon dioxide (SiO2)

Weathered granite pebble

Granite, a quartz–feldspar–mica plutonic rock

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Tumbled red jasper with a quartz vein

Jasper (microcrystalline quartz, SiO₂), likely crossed by milky quartz

Weathered quartz-rich rock, likely granite or granitic pegmatite

Quartz–feldspar aggregate; likely granite, compositionally dominated by SiO₂-rich quartz and K-/Na-feldspar

Shale with Quartz Veins

Fissile Sedimentary Rock (SiO2)

Sodalite (Sunset Sodalite)

Sodalite: Na8(Al6Si6O24)Cl2